The fact that left-handedness resp. mixed-handedness are strikingly common in patients with certain neurological disorders such as autism spectrum disorders is a frequently reported observation in medical practice. The reason why handedness is associated with these disorders is probably because both are affected by processes in early brain development. Various studies have explored this link for individual disorders and have sometimes been able to show it, and sometimes not. A meta-analysis carried out by an international research team shows that left and mixed-handedness is particularly common in people who suffer from a disorder that manifests itself early in life and is associated with linguistic symptoms. These include dyslexia, schizophrenia and autism.